By Greg Stone, Edward A. Boulter, Ian Culbert, Hussein Dhirani
A unmarried complete source for the layout, software, trying out, and upkeep of rotating machines
Filling a long-standing hole within the box, electric Insulation for Rotating Machines covers, in a single worthy quantity, all elements of the layout, deterioration, checking out, and service of insulation utilized in automobiles and turbines. Lucidly written by way of major specialists, this authoritative reference presents either historic history vital to realizing computing device insulation layout and the main updated info on new machines and the way to choose insulation platforms for them. insurance comprises such key subject matters as:
- varieties of rotating machines, windings, and rotor and stator winding construction
- comparing insulation fabrics and systems
- Stator winding and rotor winding insulation platforms in present use
- Failure mechanisms and repair
- trying out and monitoring
- upkeep strategies
Detailing over 30 assorted rotor and stator winding failure tactics and reviewing virtually 25 diverse checks and displays used to evaluate winding insulation , electric Insulation for Rotating Machines might help laptop clients keep away from pointless desktop disasters, lessen upkeep charges, and encourage higher self belief within the layout of destiny machines.
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Additional info for Electrical insulation for rotating machines
8/͙3ෆ) between the copper conductors and the grounded stator core. This high voltage requires a substantial groundwall insulation thickness. The high groundwall voltage only occurs in the coils/bars connected to the phase terminals. The coils/bars connected to the neutral have essentially no voltage across the groundwall during normal operation. Yet, virtually all machines are designed to have the same insulation thickness for both phase-end and neutral-end coils. If the coils all had different groundwall thicknesses, then, to take advantage of the smaller width of a neutral end bar or coil, the stator slot would be narrower.
3 Form-Wound Stators—Roebel Bar Type In large generators, the more the power output, the larger and mechanically stiffer each coil usually is. In stators larger than about 50 MW, the form-wound coil is large enough that there are difficulties in inserting both legs of the coil in the narrow slots in the stator core without risking mechanical damage to the coil during the insertion process. Thus, most large generators today are not made from multiturn coils, but rather from “half-turn” coils, often referred to as Roebel bars.
After the copper turns exit from the slot, they go through a 90° bend and are directed around the rotor circumference until they reach the appropriate slot, at which point they go through another 90° bend. This rotor end-winding area must be supported to prevent the centrifugal forces from breaking off the copper conductors. Furthermore, space must be left and slip planes inserted to allow the rotor winding to expand axially as it heats up when current is circulated. Also, blocking must be installed between coils in the end-winding to prevent distortion from thermal expansion forces.